Fixes various tab completion problems

src/main/java/net/knarcraft/paidsigns/container/PaidSign.java

@@ -29,7 +29,7 @@ public class PaidSign {
      */
     public PaidSign(String name, double cost, String permission, OptionState ignoreCase, OptionState ignoreColor) {
         if (name == null || name.trim().isBlank()) {
-            throw new IllegalArgumentException("Id cannot be empty");
+            throw new IllegalArgumentException("Name cannot be empty");
         }
         if (cost <= 0) {
             throw new IllegalArgumentException("Cost must be larger than 0");